I am trying to post a hardcover book but when I put in the exact ISBN from the book it appears as a paperback on the listing.  When I try to add it as a hardback the ISBN changes.  This is very confusing.  It's not like the ISBN doesn't exist, it does but it doesn't match the type of book.  How should I post this book?

Here you go:

• When your book has no ISBN
• When your book's ISBN is unknown to the PBS database (has not yet been added by regular updates)
• When your book's ISBN "brings up" another booktype in the database
  • Such as the paperback if you have the hardcover, and vice versa
  • Such as Large Print when you have the regular-font version
  • This happens when the publisher assigns the same ISBN to multiple booktypes).

If your book does not match the listing information (title, author, booktype) in the database for the ISBN on the book, it must be Posted without an ISBN

• First, make sure to look over your book really well
  • Sometimes ISBN numbers can be found in unexpected places like the spine
  • The back of the book and in the publishing information in the front of the book are the most common places to find an ISBN.
• If your book has no ISBN (or the ISBN you have doesn't work in the system):
  • Go to the Post Books page
    • From My Account: click the Post Books tab
    • From anywhere on the site: place your cursor over My Account on the toolbar at the top of the site and click Post Books in the menu that drops down.
    • From your Bookshelf, click the link "Post Books" at the top of the page, in the yellow bar.
  • On the Post Books page:
    • Click the "Post a Book without an ISBN" link at the top of the page, in the yellow bar.
    • Enter the information about the book in the form that comes up:
      • Mandatory information includes: title, author, book dimensions, Subject (genre), booktype
      • Optional information includes: Large Print, Homeschool, Publisher, # pages, Back Cover Description (synopsis of the book content), Book Cover image.
      • Your Book Cover Image needs to be less than 5 MB in size, and in .jpg format.

Sometimes the ISBN on the inside page is slightly different than the outside cover.  I caught that on some of mine not too long ago.  Is that the case here?